1. Low density. The density of polyolefin plastics is usually between 0.83 and 0.96 g/ CW ², which is a relatively light material except wood. When it is made into foam, its density is even lower, up to 0.01 0~0.050 g/ CW ². The density of steel is 7.8 g/ Cw3, and that of aluminum is 2.7 g/ CW ². Glass 2.6g/CW ², ceramics 4.0g/CW ². Each 100 kg plastic can replace other materials 750~850 kg, can reduce the weight of the vehicle, increase the effective load.

2. Good comprehensive performance in physics and chemistry. Good hand feel, wear resistance, good insulation performance to electricity, heat and sound, high transparency, high air permeability, can be widely used to manufacture electrical insulation materials, insulation and heat preservation materials; Good chemical corrosion resistance, resistance to acid, alkali, salt and other chemical substances corrosion.

3. Good coloration. Can be made into a variety of colors according to the need, there are black, gray, white, peach grain, etc.

4. Good processing performance. It can be processed into tubes, plates, films and fibers by extrusion, blowing and injection, etc., complex products can be secondary molding, and can be mass-produced by various forming methods, with high production efficiency, low cost and remarkable economic benefits. If calculated by unit volume, the cost of producing plastic parts is only 1/10 of non-ferrous metals.

5. Environmental protection and energy saving. Recycling is a material that can be promoted vigorously to meet the sustainable development strategy of human beings, and the fuel saving is more than 0.5 per 100 km.

6.Low price. At present, the price of PP on the market is 8000 yuan /t, while other plastics are generally not less than 10000 yuan /t, and the price of some plastic materials has even reached more than 40000 ~ 50000 yuan /t.

7.Disadvantages: large shrinkage, strong water absorption, poor dimensional stability, it is difficult to make high-precision products, flammable, combustion produces a lot of black smoke and toxic gas, long-term use is easy to aging, easy to deformation; But the defects can be reduced by modification.